The time course effect of moderate intensity exercise on response execution and response inhibition

This research aimed to investigate the time course effect of a moderate steady-state exercise session on response execution and response inhibition using a stop-task paradigm. Ten participants performed a stop-signal task whilst cycling at a carefully controlled workload intensity (40% of maximal aerobic power), immediately following exercise and 30 min after exercise cessation. Results showed that moderate exercise enhances a subjects’ ability to execute responses under time pressure (shorter Go reaction time, RT without a change in accuracy) but also enhances a subjects’ ability to withhold ongoing motor responses (shorter stop-signal RT). The present outcomes reveal that the beneficial effect of exercise is neither limited to motor response tasks, nor to cognitive tasks performed during exercise. Beneficial effects of exercise remain present on both response execution and response inhibition performance for up to 52 min after exercise cessation.     

骨源性因子ucOCN在运动抗抑郁中的作用机制

羧化不全骨钙素(ucOCN)是骨中成骨细胞分泌的特异性蛋白,因其在调控神经发育、神经可塑性等中的重要角色而受到神经科学领域关注。"骨-脑"串联"对话"是骨内分泌-神经介导的应答系统,ucOCN透过血脑屏障后介导单胺类神经递质、神经内分泌、神经免疫、神经再生及基因表达等机制,进而作用于海马CA3区、扣带回等脑区功能发挥来调节抑郁发生及改善。而ucOCN作为骨源性力学刺激敏感基因,运动上调其表达后进入血液循环,通过介导5-HT/GABA分泌、HPA轴功能、炎症反应、神经营养因子(BDNF等)表达或信号途径(如GSK3β/β-catenin、TLR4/miR-223/NLRP3等)激活等来实现"骨串联脑",发挥运动抗抑郁作用。通过对骨源性因子ucOCN介导脑区功能变化从而实现运动抗抑郁的作用机制进行探讨、梳理,一方面有助于更深入了解骨内分泌功能,另一方面为抑郁发生、改善和运动抗抑郁研究提供新的理论基础和研究思路。     

民航飞行员冠状动脉粥样硬化情况调查及特点分析

心血管事件成为威胁民航飞行安全的主要因素之一.为更及时地发现飞行员冠状动脉病变,提高用无创性常规辅助检查预测飞行员冠状动脉粥样硬化的准确性,对105例飞行员进行血脂、血压、血糖、体重指数、颈动脉彩色多普勒超声检查、运动负荷心电图试验以及64排双源CT冠状动脉造影检查.比较颈动脉粥样硬化与运动负荷心电图试验阳性、高危因素对冠状动脉预测的敏感性和特异性.飞行员的职业特点可能使其冠状动脉粥样硬化早于其他血管床,危险因素较其他辅助检查可能更具意义,必须综合分析各项检查才可能更准确地预测飞行员冠状动脉病变.     

EFFECTS OF A VARIABLE-RATIO REINFORCEMENT SCHEDULE WITH CHANGING CRITERIA ON EXERCISE IN OBESE AND NONOBESE BOYS

The effects of a variable-ratio schedule of reinforcement on pedaling a stationary exercise bicycle were examined. Three obese and three nonobese 11-year-old boys were individually tested five times weekly for approximately 12 weeks. A changing-criterion design was used in which each successive criterion was increased over mean performance rate in the previous phase by approximately 15%. The contingencies of the successive criteria resulted in systematic increases in rate of exercise for all children. Final variable-ratio rates were higher than those under fixed ratios found in previous research, with rates for 2 of the 3 obese boys approximating those of the nonobese.     

The Use of a Personal Trainer to Enhance Participation of Older Adults with Severe Disabilities in a Community Water Exercise Class

Inclusive instruction was provided for three older adults with profound mental retardation in a water exercise class at a local YMCA. The older adults were taught to exercise through the use of systematic prompting. A multiple baseline design across participants with an embedded reversal was used to evaluate the impact of a personal trainer. The three participants performed the exercise, but regressed without the assistance of the trainer, as demonstrated by the reversal. Data collected during peer prompting and maintenance conditions indicated that the participants continued to exercise at levels higher than baseline but lower than with a personal trainer.     

CONTINGENT EXERCISE: A MILD BUT POWERFUL PROCEDURE FOR SUPPRESSING INAPPROPRIATE VERBAL AND AGGRESSIVE BEHAVIOR

Two single-subject experiments were conducted in public school classrooms for severely emotionally disturbed children. Both experiments investigated the effects of a treatment requiring a child to exhibit a simple exercise task after a verbal or aggressive response, using reversal and multiple-baseline designs. The independent variable, contingent exercise, required standing up and sitting on the floor five to ten times contingent on an inappropriate behavior. It was found that contingent exercise was easy to carry out, and following it, the child quickly returned to the learning task that had been interrupted by the inappropriate behavior. The contingent exercise procedure required a minimum of prompting or manual guidance. Although contingent exercise was not topographically related to the inappropriate response, it decreased those responses dramatically. The results suggested that contingent exercise was not only more powerful than DRO but also could be administered independently. It was concluded that contingent exercise may constitute an alternative procedure that can be used by therapists confronted with severely abnormal behaviors. It would appear to be particularly relevant in settings where procedures such as timeout and painful consequences find restricted use. Finally, a number of guidelines have been proposed as a safeguard against the misuse of this mild but powerful procedure.     

Influence of Accelerometer Placement and/or Heart Rate on Energy Expenditure Prediction during Uphill Exercise

Studies using a triaxial accelerometer and heart rate (HR) simultaneously for estimating energy expenditure (EE) during uphill exercise are rare. Exploring the optimal location for placing the accelerometer for predicting EE during uphill exercise is essential. Sixteen healthy male participants (M ± SEM; age 25.00 ± 0.61 years; body weight 74.13 ± 2.51 kg; body height 1.74 ± 0.01 m; body mass index 24.30 ± 0.63 kg/m²) exercised on a treadmill under 12 conditions (4 speeds and 3 gradients) on 3 days. Triaxial accelerometers, an HR recorder, and a metabolic measurement system were simultaneously used. Accelerometer outputs from various anatomical locations (upper arm, chest, lower back, waist, thigh, and instep) showed significant positive correlations with EE (0.819, 0.846, 0.816, 0.820, 0.672, and 0.669, respectively; p < .05). The linear regression equation for changes in HR showed the highest coefficient of determination (r²) of .837 with 87.9% reliability. When the HR signal was included, the r² value (> .842) and reliability (87.9%) between the accelerometer outputs and EE improved. Accelerometer outputs from the waist position alone provide highly accurate EE values. Using both accelerometer outputs and HR for EE estimation during uphill exercise is feasible and improves the accuracy of EE prediction.     

Predictors of adherence to aerobic exercise in rectal cancer patients during and after neoadjuvant chemoradiotherapy

This pilot study explored predictors of adherence to exercise during and after neoadjuvant chemoradiotherapy (NACRT) in rectal cancer patients. Eighteen rectal cancer patients were prescribed three supervised aerobic exercise sessions/week during NACRT followed by ≥150 min/week of unsupervised aerobic exercise after NACRT. Although not statistically significant, adherence to supervised exercise during NACRT was meaningfully better for patients who were women (d = .82; P = .12), younger (d = ?.62; P = .30), married (d = .62; P = .42), with better mental health (r = .32; P = .21), fewer diarrhea symptoms (r = .48; P = .052), and higher anticipated enjoyment (r = .31; P = .23), support (r = .32; P = .22), and motivation (r = .31; P = .23). After NACRT, adherence was significantly better for patients who reported worse mental health (r = ?.56; P = .046) and meaningfully better for patients who were women (d = .54; P = .38), better educated (d = .77; P = .22), had no comorbidities (d = ?.63; P = .17), and exercised at baseline (d = 1.05; P = .12). Demographics, tumor side effects, and motivational variables may predict adherence to exercise during and after NACRT.     

Effects of a 6-week aerobic dance intervention on body image and physical self-perceptions in adolescent girls

Research examining the impact of physical activity on body image dissatisfaction and physical self-perceptions has been both limited and equivocal. The current research investigated the effects of 6-week aerobic dance on these variables with 50 British schoolgirls aged 13–14 years. A cross-over design was used with two equivalent groups taught normal physical education and aerobic dance in a different order. The Body Attitude Questionnaire (BAQ) and Children and Youth Physical Self-Perception Profile (CY-PSPP) were administered as pre, mid and post-test to each participant in each group before the first intervention, at the change over and after 12 weeks. The results of this study revealed that participation in 6 weeks of aerobic dance significantly reduced body image dissatisfaction (Attractiveness, Feeling Fat, Salience and Strength and Fitness) and enhanced physical self-perceptions (Body Attractiveness and Physical Self-Worth), although these improvements were not sustained. The implications and future research directions are discussed.     

Conditioned ethanol aversion in rats induced by voluntary wheel running,forced swimming,and electric shock: An implication for aversion therapy of alcoholism

This study was planned to demonstrate rats’ acquisition of aversion to ethanol solution consumed before voluntary running, forced swimming, or electric shock delivery. Wistar rats under water deprivation were allotted to four groups of eight rats each, and all rats were allowed to drink 5% ethanol solution for 15 min. Immediately after the ethanol drinking, rats of Group Run were put into the individual running wheels for 15 min, those of Group Swim were put into the individual swimming pools for 15 min, those of Group Shock received electric shocks for 15 min (15 0.45-mA shocks of 0.7s with the intershock interval of 1 min) in the individual small chambers, and those of Group Control were directly returned back to the home cages. This procedure was repeated for six days, followed by a two-day choice test of ethanol aversion where a bottle containing 5% ethanol solution and a bottle of tap water were simultaneously presented for 15 min. In the test, Groups Run, Swim, and Shock drank ethanol solution significantly less than tap water, while Group Control drank both fluids equally. The effects of running, swimming, and shock were equivalent. The successful demonstration of acquired ethanol aversion induced by exercise (running and swimming) or shock in rats suggests an avenue for clinical application of exercise and shock treatments for human alcoholics, though there are many issues to be resolved before the practical use.